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Started working on text metrics support.

This commit is contained in:
Pietro Gagliardi 2016-01-12 21:52:45 -05:00
parent 09458c794a
commit a082469cf8
2 changed files with 21 additions and 10 deletions
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18
test/page9.c
View File

@ -31,6 +31,7 @@ static void handlerDraw(uiAreaHandler *a, uiArea *area, uiAreaDrawParams *dp)
char *s;
char *family; // make compiler happy
uiDrawTextLayout *layout;
uiDrawTextFontMetrics metrics;
memset(&desc, 0, sizeof (uiDrawTextFontDescriptor));
family = uiEntryText(textFont);
@ -41,18 +42,21 @@ static void handlerDraw(uiAreaHandler *a, uiArea *area, uiAreaDrawParams *dp)
desc.SmallCaps = uiCheckboxChecked(textSmallCaps);
desc.Stretch = uiComboboxSelected(textStretch);
desc.Gravity = uiComboboxSelected(textGravity);
font = uiDrawLoadClosestFont(&desc);
uiFreeText(family);
uiDrawTextFontGetMetrics(font, &metrics);
s = uiEntryText(textString);
layout = uiDrawNewTextLayout(s, font);
uiDrawText(dp->Context, 10, 10, layout);
uiDrawFreeTextLayout(layout);
uiDrawFreeTextFont(font);
uiFreeText(s);
uiFreeText(family);
uiDrawText(dp->Context, 10, 10, layout);
uiDrawFreeTextLayout(layout);
layout = uiDrawNewTextLayout("This is a second line", font);
uiDrawText(dp->Context, 10, 10 + metrics.Ascent + metrics.Descent + metrics.Leading, layout);
uiDrawFreeTextLayout(layout);
uiDrawFreeTextFont(font);
}
static void handlerMouseEvent(uiAreaHandler *a, uiArea *area, uiAreaMouseEvent *e)

13
ui.h
View File

@ -456,6 +456,7 @@ _UI_EXTERN void uiDrawFreeFontFamilies(uiDrawFontFamilies *ff);
typedef struct uiDrawTextLayout uiDrawTextLayout;
typedef struct uiDrawTextFont uiDrawTextFont;
typedef struct uiDrawTextFontDescriptor uiDrawTextFontDescriptor;
typedef struct uiDrawTextFontMetrics uiDrawTextFontMetrics;
typedef enum uiDrawTextWeight {
uiDrawTextWeightThin,
@ -508,15 +509,21 @@ struct uiDrawTextFontDescriptor {
uiDrawTextGravity Gravity;
};
// TODO wait why do I have these functions? I don't think they provide a correct line height...
_UI_EXTERN double uiDrawTextSizeToPoints(double textSize);
_UI_EXTERN double uiDrawPointsToTextSize(double points);
struct uiDrawTextFontMetrics {
double Ascent;
double Descent;
double Leading;
double UnderlinePos;
double UnderlineThickness;
};
_UI_EXTERN uiDrawTextFont *uiDrawLoadClosestFont(const uiDrawTextFontDescriptor *desc);
_UI_EXTERN void uiDrawFreeTextFont(uiDrawTextFont *font);
_UI_EXTERN uintptr_t uiDrawTextFontHandle(uiDrawTextFont *font);
_UI_EXTERN void uiDrawTextFontDescribe(uiDrawTextFont *font, uiDrawTextFontDescriptor *desc);
// TODO make copy with given attributes methods?
// TODO yuck this name
_UI_EXTERN void uiDrawTextFontGetMetrics(uiDrawTextFont *font, uiDrawTextFontMetrics *metrics);
_UI_EXTERN uiDrawTextLayout *uiDrawNewTextLayout(const char *text, uiDrawTextFont *defaultFont);
_UI_EXTERN void uiDrawFreeTextLayout(uiDrawTextLayout *layout);